Responses from speakermaster

RMAF 2021 Cancelled
Does not surprise me because audio gear is not what it used to be and the attendance and interest are also not high, so therefore the show closes, sad. 
If Power Cords Don't Matter...
Both make a big difference in any system on any quality of decent gear for many reasons, but the big one is natural tonality, free cords make the gear work but aftermarket cords make the gear shine. 
Auditioning headphones (ethically)?
I have always found a dealer with a good selection of headphones to listen and compare them to each other in real time and pick the one i liked best because headphones are such a personal and crucial item especially for sound and fit. 
B&W 800 D4's, Room size, & general Q's
I would listen to some more speakers than b and w speakers, they are a big brand name but you can get a lot better sound elsewhere and the same with mcintosh electronics. At one point in time mac was the best or one of the best but that is no long... 
PrimaLuna Evo 200 underwhelming
There is an interaction between your speakers and the tube amp because the tube amp should be strong in the midrange unless a mismatch occurs, which is what you are experiencing. 
Viking Acoustic - Fantom speakers
Hearing your first good horn speaker can be a real ear opener for sure, the detail, dynamics, sound projection, and accuracy can be scary good compared to other types of speakers especially in less than optimal rooms and setups. 
Whats on your turntable tonight?
The cure, panic at the disco, five finger death punch, and the police. 
Helping a friend build a new system
I would tell him to go for a vintage american bookshelf speaker with a good used integrated tube amp and some decent kimber wire and interconnects. He will have great sound and for well under the 7 to 8 k mark. I would try a vintage pro audio moni... 
New TT, Arm and MC Cartridge
I think that they are all good choices and you should love how your rig looks and sounds but make sure you get a superior phono stage to play it all on or you will not get the magic you crave. 
My stereo is haunted!!
Sounds like have tried  lot of things, my only suggestion would be to run a dedicated line to your system, because a power conditioner will only add hum if there is a ground problem in the system or the line. 
How important is it to have identical speaker cable length?
It is very important to have the same speaker cable length because the sound will change with different cable lengths but, you will only hear that on certain types of speakers. 
Decide between ARC Ref 6SE and Aesthetix Calypso Eclipse
They are both good choices but i would look for a pre 1997 arc preamp because it will outperform both of them and for a lot less money. 
High-pass line filter to relieve main speakers from low frequency
Any new sub will have a crossover filter in it for that purpose, which is to relieve your main speakers of bass duties, but if it does not, sure that is a great idea. It used to be that the satellites ran full range to augment he sub, but times ha... 
Power cord supplied with Luxman L-509X Integrated Amp
You can have a qualified technician wire a normal iec cord in the slot to get better sound but i would use it as is until you mesh it with the rest of your system. 
Bad recordings and high end audio
They are just trying to play music that sounds good on their speakers which will not be led zeppelin because led zeppelin requires a speaker that will play it all meaning all kinds of music which most audiophile approved types will not.